In 1999, The US AIr Force Academy Studied Cookies. No, Not The Internet Kind.

There are 1261.6 chips/bag Each bag has 42 pieces of cookies so, there are about 1261.6/42 = 26.28 => 27 chips/cookies

1261.6 divided by 42 will get you around 30 (the mean number of chips in a random cookie)

117.6 divided by 42 will get you 2.8, round off to 3 (Standard deviation)

so the answer should be...

30 +/- 3...... either 27 or 33

The mean number of chocolate chips in the sample is 1261.6 per bag. Since there are 48 cookies per bag, the mean number of chocolate chips per cookie is: $\frac{1261.6}{48}=26.283$

The possible choice closest to this answer is $\boxed{27}$ .

There are multiple distractions in this question. There is a sample size, and standard deviation. Don't go calculating standard errors (SE) here. Not necessary yet. The question is simply: If a cookie is chosen, how many chocolate chips will it have on an average?

The question actually boils down to 3 steps:

a) The number of cookies in the bag -- 48

b) The number of chocolate chips in a bag of Chips ahoy -- 1261.6

Hence, <b> average number of chips per cookie = 1261.6/48 = 26.28 </b>

c) You don't see this exact answer (how can you have .28 of a chip? :)) but since the question asks "most likely", you know you need to find the closest number to 26.28, i.e. 27

27

27

27

I guess